Hi cocoon, thank you for your support ! God I realize I haven't updated this thread in ages.cocoon wrote: ↑Feb 08, 2018 12:32 pmHi! nice job man! im also developing engine for inline skates.
I hope i will have working prototype assambled in next week. It is special kind of motor.. wheel is part of motor. Stator is mounted on the chassis. Setup is very light.. we will see about power and efficiency. I managed to mount powerfull neodium magnets 4,4 kg on wheels.
I will make my own controller from arduino uno. motor will have 2 hall sensors.
simple way would be to contact u-motor company and order custom 100mm x 20mm hub motor. They are quite flexible as i know
Sorry for late reply! Motors look a bit big to me but sure there's something to be done with axial designcocoon wrote: ↑Feb 10, 2018 3:25 amhttps://www.youtube.com/watch?v=6m_iIbX0gmA i see the future in this type of motors (axial flux with permanent magnets). It is very easy to cool the coils becouse they are on each side of the rotor and not moving. Even some cryogenic cooling is possible in future. This can boost engine peak power to 1000 kW . This can be possible in hybrid LNG (liquid natural gas) semi trucks or cars. The liquid lng has to be avaporated before use in combustion engine and this can be done in engine similar like YASA. In this way motor can be cooled to -158°C. Than you just need monsterus battery with approx 1500A peak and 700V. ehhh daydreaming
Hi Dogu, welcome!Dogu-ya wrote: ↑Jun 05, 2018 1:59 amHi new to this forum, been a long time stalker of this thread.
I've also wanted to design and build my own electric inlines for a long time, I am finally determined to start.
Been procrastinating by going to the army for 2 years, going to university, getting a job for 3 years as an engineer.
Time to start work!
Are the only ones in the market right now the Thundrblades?
The crowdfunding looks like it kicked off really well.
Off the bat, I hate the idea of hub motors and friction drives.
It's the beginning, previously I've messed with high powered lasers, 3d printing, high voltage generators, robotics, etc.Vanarian wrote: ↑Jun 05, 2018 4:27 amHi Dogu, welcome!
You did choose the rough path then, and seeing you're a soldier you're fit for it! I'll gladly help if I can.
Yep Thundrblade are the only choice available for now (it is Ryuudan skates) & I'm working my back to officially release AT-One
Why hate on hubs / direct drive? It is an optimal design space wise, and many tweaks can be done from there (planetary epicyclic gears for example). As for friction drive, well it is not the best, true, but it is a quick workaround solution to start riding!
Have you already started or is it the beginning of your skates?
Feel free to post your updates here if you like at least I get notified and can reply hahaDogu-ya wrote: ↑Jun 20, 2018 9:26 pmNot sure if I should start my own post or hijack this one(?)
Seems most inline skate discussions happen here.
I am done drafting my "small-scale" 2 way clutch, Inventor is telling me it will fail at ~3Nm, which is bad...
A few short calculations imply that torque needed is 7.5 ~ 15Nm. Probably more.
The only way is to scale up, I can get 40Nm if I go up to 80mm, but the clutch will be the size of a small wheel
Maybe it would be best to have a conventional clutch that engages when driving and automatically disengages when motor is off.
Although I'm tempted to fabricate it just for a proof of concept, waiting on quote from my fabricator.
I see many inline skating youtubers talking about the thundrblades recently, but the crowdfunding still seems stagnant.
Oddly, or maybe not so unexpectedly after all, the size of a 20Nm assembly is really close to that of a 40Nm.Vanarian wrote: ↑Jun 21, 2018 1:32 pmWhich acceleration level do you want to achieve ? Plenty of torque is great (I'm kinda a power addict haha), but it should also be tame enough for human balance ! 10-15Nm should be plenty enough for a strong start I think, so if you can size your clutch toward 20Nm tolerance you should have overbuilt it enough for reliable power IMHO.
That's new to me.